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Wed, 10 Jul 2024 21:38:29 +0000 From: Fabiano Rosas To: Peter Xu Cc: Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org, qemu-block@nongnu.org, Laurent Vivier , Tyrone Ting , Bin Meng , Hao Wu , Francisco Iglesias , Paolo Bonzini , Thomas Huth , =?utf-8?Q?C=C3=A9dric?= Le Goater , qemu-arm@nongnu.org, Joel Stanley , Sai Pavan Boddu , devel@lists.libvirt.org, Luc Michel , =?utf-8?Q?C?= =?utf-8?Q?=C3=A9dric?= Le Goater Subject: Re: [PATCH v3 06/17] hw/sd/sdcard: Do not store vendor data on block drive (CMD56) In-Reply-To: References: <20240627162232.80428-1-philmd@linaro.org> <20240627162232.80428-7-philmd@linaro.org> <87cynmfggx.fsf@suse.de> <87a5ipfigb.fsf@suse.de> <874j8xfc9s.fsf@suse.de> <871q41f2pk.fsf@suse.de> Date: Wed, 10 Jul 2024 18:38:26 -0300 Message-ID: <87ttgxdj1p.fsf@suse.de> MIME-Version: 1.0 Content-Type: text/plain X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; 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envelope-from=farosas@suse.de; helo=smtp-out1.suse.de X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: VFoSiZeOBZ2+ Peter Xu writes: > On Wed, Jul 10, 2024 at 04:48:23PM -0300, Fabiano Rosas wrote: >> Peter Xu writes: >> >> > On Wed, Jul 10, 2024 at 01:21:51PM -0300, Fabiano Rosas wrote: >> >> It's not about trust, we simply don't support migrations other than >> >> n->n+1 and (maybe) n->n-1. So QEMU from 2016 is certainly not included. >> > >> > Where does it come from? I thought we suppport that.. >> >> I'm taking that from: >> >> docs/devel/migration/main.rst: >> "In general QEMU tries to maintain forward migration compatibility >> (i.e. migrating from QEMU n->n+1) and there are users who benefit from >> backward compatibility as well." >> >> But of course it doesn't say whether that comes with a transitive rule >> allowing n->n+2 migrations. > > I'd say that "i.e." implies n->n+1 is not the only forward migration we > would support. > > I _think_ we should support all forward migration as long as the machine > type matches. > >> >> > >> > The same question would be: are we requesting an OpenStack cluster to >> > always upgrade QEMU with +1 versions, otherwise migration will fail? >> >> Will an OpenStack cluster be using upstream QEMU? If not, then that's a > > It's an example to show what I meant! :) Nothing else. Definitely not > saying that everyone should use an upstream released QEMU (but in reality, > it's not a problem, I think, and I do feel like people use them, perhaps > more with the stable releases). > >> question for the distro. In a very practical sense, we're not requesting >> anything. We barely test n->n+1/n->n-1, even if we had a strong support >> statement I wouldn't be confident saying migration from QEMU 2.7 -> QEMU >> 9.1 should succeed. > > No matter what we test in CI, I don't think we should break that for >1 > versions.. I hope 2.7->9.1 keeps working, otherwise I think it's legal to > file a bug by anyone. > > For example, I randomly fetched a bug report: > > https://gitlab.com/qemu-project/qemu/-/issues/1937 > > QEMU version: 6.2 and 7.2.5 > > And I believe that's the common case even for upstream. If we don't do > that right for upstream, it can be impossible tasks for downstream and for > all of us to maintain. But do we do that right currently? I have no idea. Have we ever done it? And we're here discussing a hypothetical 2.7->9.1 ... So we cannot reuse the UNUSED field because QEMU from 2016 might send their data and QEMU from 2024 would interpret it wrong. How do we proceed? Add a subsection. And make the code survive when receiving 0. @Peter is that it? What about backwards-compat? We'll need a property as well it seems.